>This vulnerability is not that dangerous because, firstly, if you want >to exploit it, you must have exact file tree and correct name of the >malicious script because that variable is never used alone but always >in concatanation with script name and generic extension In a typical PHP exploit scenario, the attacker could merely add a null byte ("%00") to the phpbb_root_path parameter, which would then cause the include call to ignore this extra file tree/name information. Is there some reason why a null byte wouldn't work in this situation? - Steve